Replace the HID (High Intensity Discharge) headlight ballast module, which controls voltage to the HID bulbs and commonly fails causing headlight flickering or complete failure.

Warnings

Tools required

Parts

• HID ballast module × 1 — Use OEM Ford specification or aftermarket equivalent (specify driver or passenger side)
• Wire connector seals (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and turn off ignition
2. Allow headlights to cool for at least 15 minutes if recently operated
3. Open hood and secure with prop rod
4. Disconnect negative battery terminal and wait minimum 5 minutes for HID capacitor discharge
5. Determine which side (driver or passenger) requires ballast replacement

Procedure

1. 1

   Access headlight assembly
   Locate the headlight assembly on the affected side. Remove the two upper headlight mounting bolts using a 10mm socket. You do not need to fully remove the headlight assembly for ballast access on this model.
2. 2

   Remove headlight access cover
   Rotate the round plastic access cover on the rear of the headlight assembly counterclockwise and remove it. This provides access to the back of the headlight where the ballast is mounted.
3. 3

   Locate and identify ballast module
   Using a flashlight, locate the HID ballast module mounted on the back or side of the headlight assembly. The ballast is a rectangular metal box approximately 4x3 inches with two wire harness connectors and one high-voltage wire going to the HID bulb. Note the orientation and routing of all connections before removal.
4. 4

   Disconnect ballast electrical connectors
   Press the release tab on the main power connector and pull straight out to disconnect. Disconnect the high-voltage connector going to the HID bulb by pressing the release clip and pulling firmly. The connector may be tight due to weatherproofing seals.
5. 5

   Remove ballast mounting bolts
   Remove the ballast mounting bolts using an 8mm socket. Most F-150 HID ballasts use two mounting bolts. Support the ballast with one hand while removing the final bolt to prevent it from falling into the engine bay.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
6. 6

   Remove old ballast
   Carefully withdraw the old ballast from the headlight assembly, threading wire harness through any retaining clips. Inspect the mounting area for corrosion or moisture damage. Clean mounting surface with a clean, dry cloth if necessary.
7. 7

   Prepare new ballast for installation
   Remove new ballast from packaging. Compare with old unit to verify correct part. Inspect all electrical connectors on new ballast for damage or debris. Apply a small amount of dielectric grease to connector terminals if desired for corrosion protection.
8. 8

   Install new ballast
   Position the new ballast in the mounting location with the same orientation as the original. Thread wire harnesses through any retaining clips. Align mounting holes and start both mounting bolts by hand to ensure proper thread engagement.
9. 9

   Torque ballast mounting bolts
   Using a torque wrench, tighten the ballast mounting bolts to specification in a cross-pattern if applicable. Ensure the ballast is seated flush against the mounting surface and does not rock or move.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
10. 10

    Reconnect electrical connectors
    Connect the high-voltage wire to the HID bulb first, ensuring it clicks firmly into place. Then connect the main power harness connector to the ballast, again listening and feeling for a positive click. Gently tug each connector to verify secure connection.
11. 11

    Reinstall headlight access cover
    Align the tabs on the headlight access cover with the slots on the headlight housing. Rotate clockwise until it stops and is fully seated. Ensure the seal is properly positioned to prevent moisture intrusion.
12. 12

    Reconnect battery and test
    Reconnect the negative battery terminal and torque to specification. Turn the ignition to the ON position and activate the headlights. HID bulbs typically take 5-10 seconds to reach full brightness and may appear slightly pink or blue during warm-up before stabilizing to white.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. If headlight mounting bolts were fully removed, reinstall and torque appropriately (torque not specified for this component in database)
2. Verify all wire harnesses are properly routed and secured in factory retaining clips to prevent chafing
3. Close hood and verify headlight operation in both low and high beam modes

Verification

• With headlights on, verify affected headlight illuminates properly without flickering or delay beyond normal HID warm-up period
• Check that headlight color matches the opposite side (should be consistent white after warm-up)
• Activate high beams and verify proper operation
• Turn headlights off and on several times to confirm reliable ignition
• Inspect for any warning lights on instrument cluster related to exterior lighting
• After first test drive, re-inspect ballast mounting area to ensure no moisture intrusion through access cover

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